They're listed in alphabetical order.
Amazon Mechanical Turk
A marketplace for work that requires human intelligence. Based on the idea that there are still many things that human beings can do much more effectively than computers, such as identifying objects in a photo or video, performing data de-duplication, transcribing audio recordings, or researching data details.
Here you can write about anything you want, as long as it isn't copied, and get paid between $1 and $4 depending on the length of the article.
As the name would suggest, a site putting you in touch with people that are looking for writers.
Serving over 10.000 websites by providing them access to almost 30.000 writers, Constant-Content claims to have developed the most comprehensive and quality articles production system on the web. You can either write an article, which becomes available to purchase, or respond to specific requests.
A chance to write articles on 'How To' do something. Payments are only made to residents of the USA, however.
Freelance Writing Jobs
Again, the name is self-explanatory.
You can earn cash for contributed work, daily revenue share and writing contests.
Lulu is a self-publishing site where you can write your own books and e-books and sell them.
Displaying available writing jobs.
Run by ProBlogger, it lists regularly updated jobs available to bloggers.